/Engine/Plugins/Runtime/MeshModelingToolset/Source/MeshModelingTools/Public/EditMeshPolygonsTool.h
(An Outset operation stitches in a larger version of selected faces inside the existing ones)
[UFUNCTION](Programming/UnrealArchitecture/Reference/Functions)(CallInEditor, Category=FaceEdits, Meta=(DisplayName="Outset", DisplayPriority=3)) void Outset()